package com.zpark.cloud.alibaba.filters;

import com.alibaba.nacos.common.utils.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ResponseStatusException;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 自定义全局过滤器
 * 自定义全局过滤器需要实现GlobalFilter和Ordered接口
 */
@Component
public class AuthGlobalFilter implements GlobalFilter, Ordered {


    /**
     * 完成判断逻辑
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        String token = request.getHeaders().getFirst("token");
        if (StringUtils.isBlank(token)) {
            System.out.println("鉴权失败");
            return Mono.error(new ResponseStatusException(HttpStatus.UNAUTHORIZED, "Authentication Failed"));
        }
        //调用chain.filter继续向下游执行
        return chain.filter(exchange);
    }

    /**
     * 顺序,数值越小,优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 1;
    }
}
